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Hey Jud - Air Source Heat Pump - mini-split, etc. I don't think the model is terribly important - I think you can connect any compressor to an inside fan unit and then into existing ductwork. But I'm hardly an expert.

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I'm currently in the design stage to install a Fujitsu ducted mini-split. It is for a 685sf apartment.

The issue that I'm having though is finding someone to design the ductwork. The external static pressure of the unit is a low 0.35" of water. That's quite low so great duct design is imperative.

I paid a designer already and have looked over his work and twice now have found issues. I know enough about HVAC to see them. Unfortunately, I can no longer count on this guy. He seems a little put off by my questioning of his work but he admits that I am finding issues.

Mitsubishi makes a ducted mini-split but its external static pressure is 0.20" of water. That is real low and probably only suited for very very short duct runs.

The Fujitsu has a higher SEER, higher static pressure, a higher heating capacity, can be mounted horizontally or vertically, and one or two other advantages.

The Mitsu is the SEZ-KD/SUZ-KA model but Mitsu doesn't seem to have a cut sheet for it.
I've attached the Fujitsu sheet. I'll be using the 9,000k

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Eddie-
Thanks for the info. We ended up using a 1.5 ton unit and without alot of trouble was able to re-configure the duct work so it covers about a 1000 SF instead of the 650 we originally were planning to cover. But it is good to know about this for the future. -Jud